CN114933882A - Durable sealant with ultrahigh elongation, high adhesion and high toughness and preparation method thereof - Google Patents
Durable sealant with ultrahigh elongation, high adhesion and high toughness and preparation method thereof Download PDFInfo
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- CN114933882A CN114933882A CN202210669044.8A CN202210669044A CN114933882A CN 114933882 A CN114933882 A CN 114933882A CN 202210669044 A CN202210669044 A CN 202210669044A CN 114933882 A CN114933882 A CN 114933882A
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- 239000000565 sealant Substances 0.000 title claims abstract description 110
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000004814 polyurethane Substances 0.000 claims abstract description 44
- 229920002635 polyurethane Polymers 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000004611 light stabiliser Substances 0.000 claims abstract description 15
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 14
- 239000007822 coupling agent Substances 0.000 claims abstract description 13
- 239000004014 plasticizer Substances 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 47
- 238000002156 mixing Methods 0.000 claims description 39
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 18
- 229910052746 lanthanum Inorganic materials 0.000 claims description 17
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 17
- WBHHMMIMDMUBKC-QJWNTBNXSA-M ricinoleate Chemical compound CCCCCC[C@@H](O)C\C=C/CCCCCCCC([O-])=O WBHHMMIMDMUBKC-QJWNTBNXSA-M 0.000 claims description 17
- 229940066675 ricinoleate Drugs 0.000 claims description 17
- 235000012424 soybean oil Nutrition 0.000 claims description 17
- 239000003549 soybean oil Substances 0.000 claims description 17
- 239000003054 catalyst Substances 0.000 claims description 15
- RRAFCDWBNXTKKO-UHFFFAOYSA-N eugenol Chemical compound COC1=CC(CC=C)=CC=C1O RRAFCDWBNXTKKO-UHFFFAOYSA-N 0.000 claims description 14
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims description 12
- 229920001046 Nanocellulose Polymers 0.000 claims description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000001704 evaporation Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- LCFVJGUPQDGYKZ-UHFFFAOYSA-N Bisphenol A diglycidyl ether Chemical compound C=1C=C(OCC2OC2)C=CC=1C(C)(C)C(C=C1)=CC=C1OCC1CO1 LCFVJGUPQDGYKZ-UHFFFAOYSA-N 0.000 claims description 7
- NPBVQXIMTZKSBA-UHFFFAOYSA-N Chavibetol Natural products COC1=CC=C(CC=C)C=C1O NPBVQXIMTZKSBA-UHFFFAOYSA-N 0.000 claims description 7
- 239000005770 Eugenol Substances 0.000 claims description 7
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 7
- UVMRYBDEERADNV-UHFFFAOYSA-N Pseudoeugenol Natural products COC1=CC(C(C)=C)=CC=C1O UVMRYBDEERADNV-UHFFFAOYSA-N 0.000 claims description 7
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 claims description 7
- XXBDWLFCJWSEKW-UHFFFAOYSA-N dimethylbenzylamine Chemical group CN(C)CC1=CC=CC=C1 XXBDWLFCJWSEKW-UHFFFAOYSA-N 0.000 claims description 7
- 229960002217 eugenol Drugs 0.000 claims description 7
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 7
- 230000004224 protection Effects 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 229920002678 cellulose Polymers 0.000 claims description 6
- 239000001913 cellulose Substances 0.000 claims description 6
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 6
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 5
- 235000019198 oils Nutrition 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- SGCFZHOZKKQIBU-UHFFFAOYSA-N tributoxy(ethenyl)silane Chemical compound CCCCO[Si](OCCCC)(OCCCC)C=C SGCFZHOZKKQIBU-UHFFFAOYSA-N 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 4
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000326 ultraviolet stabilizing agent Substances 0.000 claims description 4
- MIMDHDXOBDPUQW-UHFFFAOYSA-N dioctyl decanedioate Chemical compound CCCCCCCCOC(=O)CCCCCCCCC(=O)OCCCCCCCC MIMDHDXOBDPUQW-UHFFFAOYSA-N 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- CYMHAQCMKNVHPA-UHFFFAOYSA-N 3-butyl-2-heptan-3-yl-1,3-oxazolidine Chemical group CCCCC(CC)C1OCCN1CCCC CYMHAQCMKNVHPA-UHFFFAOYSA-N 0.000 claims description 2
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 claims description 2
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000047 product Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 41
- 230000032683 aging Effects 0.000 description 10
- 238000001035 drying Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 239000004432 silane-modified polyurethane Substances 0.000 description 5
- 239000006087 Silane Coupling Agent Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 125000000524 functional group Chemical group 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- SBRXLTRZCJVAPH-UHFFFAOYSA-N ethyl(trimethoxy)silane Chemical compound CC[Si](OC)(OC)OC SBRXLTRZCJVAPH-UHFFFAOYSA-N 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002516 radical scavenger Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000004526 silane-modified polyether Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000004584 weight gain Effects 0.000 description 2
- 235000019786 weight gain Nutrition 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000012945 sealing adhesive Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
- C08K2003/2213—Oxides; Hydroxides of metals of rare earth metal of cerium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention belongs to the technical field of sealants, and discloses a durable sealant with ultrahigh elongation, high adhesion and high toughness and a preparation method thereof. The sealant is prepared by adding auxiliary materials such as nano calcium carbonate powder, an ultraviolet light stabilizer, a water removing agent, a plasticizer, a coupling agent and the like on the basis of modified polyurethane, has the characteristics of ultrahigh elongation, high durability, high resilience, high water resistance and high cohesiveness with concrete, and also has remarkable self-repairing performance.
Description
Technical Field
The invention relates to the technical field of sealants, in particular to a sealant with high elongation, high viscosity, good rebound resilience and long service life.
Background
Meanwhile, due to the existence of external constraint, the concrete structure cannot deform freely, temperature stress can be generated, and when the temperature stress exceeds the ultimate tensile strength of the concrete, temperature cracks can possibly occur, so that the durability of the concrete structure is adversely affected. Therefore, concrete sealing adhesives have also been rapidly developed.
At present, the main concrete bonding glue applied in domestic market is Polyurethane (PU) sealant, silane modified polyurethane (SPU) sealant, silane modified polyether (MS) sealant and the like.
The MS glue is prepared by taking silane modified polyether as a base, adding some inorganic fillers such as calcium carbonate and the like as an auxiliary, and adding some chemical modifiers such as thixotropic agents, antioxidants and the like, is generally characterized by low modulus, but has poor viscosity, water resistance and rebound resilience with concrete, easy aging, poor weather resistance and short service life. The SPU sealant is used as an organosilicon modified product of the PU sealant, so that the weather resistance is greatly improved, but the silane modification weakens the polarity of the main body structure of the SPU sealant, so that the bonding property with a concrete substrate is poor.
Compared with MS glue and SPU glue, the PU glue has the best bonding property with concrete and excellent elasticity, but the PU glue has relatively insufficient ultraviolet resistance, insufficient tensile strength when used outdoors, low toughness, easy pulverization and cracking and is not durable; and do not have a healing function by itself, once the construction project is driven by various factors such as: factors such as foundation settlement, thermal expansion and cold contraction cause the gap to widen, the aged bonding force of the sealant is reduced, the gap is separated, the sealing and waterproof effects are lost, the waterproof sealing maintenance is required to be carried out again, and the difficulty in the resealing maintenance is increased for large buildings, bridges and tunnel engineering.
Disclosure of Invention
In view of this, the invention provides a sealant which has the characteristics of self-healing, ultrahigh elongation, high viscosity, high resilience and long service life.
In order to achieve the purpose, the invention adopts the following technical scheme:
a durable sealant with ultrahigh elongation, high adhesion and high toughness is prepared from modified polyurethane and auxiliary materials.
Preferably, the auxiliary materials consist of nano calcium carbonate powder, an ultraviolet light stabilizer, nano cellulose, epoxidized soybean oil, a water removing agent, a plasticizer, a coupling agent and lanthanum ricinoleate.
Preferably, the weight ratio of the modified polyurethane to the auxiliary materials is 10: 1-3.
Preferably, in the auxiliary materials, by weight, 20-30 parts of nano calcium carbonate powder, 1.1-2.5 parts of ultraviolet light stabilizer, 2-4 parts of nano cellulose, 3-5 parts of epoxidized soybean oil, 1.5-2.5 parts of water remover, 1.3-1.7 parts of plasticizer, 1.2-2.4 parts of coupling agent and 0.3-0.8 part of lanthanum ricinoleate
Preferably, the ultraviolet light stabilizer is nano cerium oxide and Al 2 O 3 The weight ratio is as follows: 1-2: 1.3-1.6.
Preferably, the coupling agent is any one of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane (gamma PS), 2- (3, 4-epoxycyclohexyl) Ethyltrimethoxysilane (ES) and Vinyltributoxysilane (VTBS).
Preferably, the plasticizers are: any one of 52# chlorinated paraffin, dioctyl sebacate and dioctyl phthalate.
Preferably, the water scavenger is 3-butyl-2- (1-ethylpentyl) oxazolidine (ALT-201).
Preferably, the ultraviolet light stabilizer is nano cerium oxide and Al 2 O 3 Mixing according to the weight ratio, placing the mixture into an ethanol solution, fully stirring and dissolving, slowly evaporating the solvent, evaporating until no ethanol flows out, placing the obtained product into an internal mixer for mixing, wherein the internal mixing temperature is 150-.
Preferably, the preparation process of the modified polyurethane comprises the following steps: mixing eugenol glycidyl ether, hexamethylene diisocyanate and a polyurethane prepolymer according to the weight ratio of 1-1.5:3-5:10, heating the mixture to 120 ℃ in an oil bath, and dehydrating the mixture for 1-2 hours under the vacuum degree of 0.05-0.1 MPa; under the protection of nitrogen, cooling to 50-60 ℃, adding a catalyst with the mass fraction of 0.1-0.6% of polyurethane prepolymer, and reacting for 1-2.5h at constant temperature; after the reaction is finished, washing the mixture for 3 times by using deionized water, and placing the mixture at the temperature of between 50 and 60 ℃ for vacuum drying until the weight is constant to obtain the catalyst.
Preferably, in the preparation process of the modified polyurethane, the catalyst is N, N-dimethylbenzylamine and bisphenol A diglycidyl ether in a weight ratio of 0.1-0.5: 2-2.5 of the mixture. .
Preferably, the catalyst is obtained by mixing N, N-dimethylbenzylamine and bisphenol A diglycidyl ether, adding the mixture into anhydrous acetone with the weight 1-1.2 times of the weight of the mixture, and quickly and uniformly stirring the mixture.
Preferably, the preparation method of the durable sealant with ultrahigh elongation, high adhesion and high toughness comprises the following steps:
a first step; heating the modified polyurethane to 110-;
a second step; mixing the prepared component A with nano-cellulose, epoxidized soybean oil, a coupling agent, a plasticizer and lanthanum ricinoleate in sequence, adding the mixture into an ethanol solution which is 1-1.5 times of the weight of the mixture and has the mass fraction of 70-80%, stirring and dispersing for 20-30min at the speed of 1000-2000r/min, adding a water removing agent, reacting for 10-15min, and defoaming for 5-10min under the condition that the vacuum degree is 0.1-0.2MPa at the temperature of 70-90 ℃ to obtain the epoxy resin composition.
According to the technical scheme, compared with the prior art, the invention discloses and provides the durable sealant with ultrahigh elongation, high adhesion and high toughness and the preparation method thereof.
1. The sealant prepared by the invention is prepared by adding auxiliary materials such as nano calcium carbonate powder, an ultraviolet light stabilizer, a water scavenger, a plasticizer, a coupling agent and the like on the basis of modified polyurethane, tests show that the sealant has good weather resistance, the elongation at break is more than 900% after 1500h ultraviolet aging, the elastic recovery rate is more than 90%, the surface does not crack, the mass loss rate is lower than or equal to 1, and the sealant still can be well bonded with a concrete base material after thermal aging, cold drawing-hot pressing fatigue tests; the destructive test result shows that the adhesive failure area of the sealant and concrete is 0%, and the self-leveling test result shows that the sealant has the advantages of high self-leveling speed, thin leveling thickness, smooth and flat surface after self-leveling, short surface drying time and contribution to shortening the construction period in the actual construction process. The sealant prepared by the invention has the characteristics of excellent bonding performance with concrete, ultrahigh elongation, high durability, high resilience and excellent self-leveling performance.
2. The modified polyurethane is prepared by capping polyurethane prepolymer by adopting eugenol glycidyl ether and hexamethylene diisocyanate and then utilizing a compounded complexing amine catalyst, according to a mechanism of spontaneously repairing damage, the modified polyurethane prepared by the invention is intrinsic, does not depend on a repairing agent, and can form a strong pi-pi conjugated system due to the fact that a large number of functional groups such as carbonyl, amino and the like exist in the prepared modified polyurethane when a material is damaged or damaged, and the damaged part is polymerized and recovered again under the strong action of continuous stacking of pi-pi, so that the self-healing repair performance is excellent under the action of no external force. Tests prove that the self-healing efficiency of the sealant prepared by the invention at 30 ℃ can reach 97.80%, and the self-healing efficiency at-30 ℃ can reach 96.63%.
3. In the preparation of the sealant, epoxidized soybean oil and lanthanum ricinoleate are added, and in a reaction system, the epoxidized soybean oil and the lanthanum ricinoleate are crosslinked with each other to form a water-shielding compact network around the modified polyurethane, so that the permeation of water molecules is hindered, and the water resistance of the sealant prepared by the invention is improved. Tests show that the sealant prepared by the invention is soaked in distilled water for 48 hours, and the weight gain rate is below 11%.
4. When the sealant is prepared, the nanocellulose is added, the nanocellulose has excellent performances such as unique reproducibility, biodegradation, high mechanical strength and the like, in a reaction system, two ends of the added silane coupling agent contain different functional groups, one end of the silane coupling agent interacts with a hydroxyl functional group in the nanocellulose, the other end of the silane coupling agent interacts with a functional group on the modified polyurethane, and the silane coupling agent and the functional groups are connected together through the action of a bridge, so that the polarity of the surface of the nanocellulose is reduced, the hydrophobicity of the sealant is enhanced, the water resistance of the sealant is further improved, the nanocellulose is uniformly dispersed around the modified polyurethane through the action of the bridge, the prepared sealant has stable components, and the physicochemical performance of the sealant is further improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment 1 of the invention discloses a durable sealant with ultrahigh elongation, high adhesion and high toughness, which comprises, by weight, 301.3 parts of modified polyurethane, 20 parts of nano calcium carbonate powder, 1.1 parts of an ultraviolet light stabilizer, 2 parts of nano cellulose, 3 parts of epoxidized soybean oil, ALT-2011.5 parts, 1.3 parts of No. 52 chlorinated paraffin, 1.2 parts of gamma PS and 0.3 part of lanthanum ricinoleate.
The ultraviolet light stabilizer is prepared by mixing nanometer cerium oxide and Al 2 O 3 Mixing the materials according to the weight ratio of 1:1.3, placing the materials into an ethanol solution, fully stirring and dissolving the materials, slowly evaporating the solvent, evaporating the solvent until no ethanol flows out, placing the obtained product into an internal mixer for mixing, wherein the internal mixing temperature is 150 ℃, the internal mixing time is 5min, and the screw rotating speed is 30r/min, thus obtaining the product.
The preparation process of the modified polyurethane comprises the following steps: mixing eugenol glycidyl ether, hexamethylene diisocyanate and polyurethane prepolymer according to the weight ratio of 1:3:10, heating to 100 ℃ in an oil bath, and dehydrating for 1h under the vacuum degree of 0.05 MPa; under the protection of nitrogen, cooling to 50 ℃, adding a catalyst with the mass fraction of 0.1% of the polyurethane prepolymer, and reacting for 1h at constant temperature; after the reaction is finished, washing the mixture for 3 times by using deionized water, and placing the mixture at 50 ℃ for vacuum drying until the weight is constant to obtain the product; wherein, the catalyst is prepared by mixing N, N-dimethylbenzylamine and bisphenol A diglycidyl ether according to the weight ratio of 0.1: 2, mixing and adding the mixture into anhydrous acetone with the weight 1 time that of the mixture, and quickly and uniformly stirring the mixture to obtain the product.
The preparation method of the durable sealant with ultrahigh elongation, high adhesion and high toughness in the embodiment 1 of the invention comprises the following steps:
a first step; heating the modified polyurethane to 110 ℃, standing for 10min in vacuum, sequentially mixing with the nano calcium carbonate powder and the ultraviolet stabilizer, stirring and dispersing at 1500r/min for 30min, and filtering by using a 500-mesh filter screen to obtain a component A;
a second step; mixing the prepared component A with nano-cellulose, epoxidized soybean oil, a coupling agent, a plasticizer and lanthanum ricinoleate in sequence, adding the mixture into an ethanol solution with the mass fraction of 70% and the weight of 1 time of the mixture, stirring and dispersing for 20min at 1000r/min, adding a water removing agent, reacting for 10min, and defoaming for 5min under the condition that the vacuum degree is 0.1MPa at 70 ℃ to obtain the epoxy resin.
Example 2
The embodiment 2 of the invention discloses a durable sealant with ultrahigh elongation, high adhesion and high toughness, which comprises 160.8 parts by weight of modified polyurethane, 30 parts by weight of nano calcium carbonate powder, 2.5 parts by weight of ultraviolet light stabilizer, 4 parts by weight of nano cellulose, 5 parts by weight of epoxidized soybean oil, ALT-2012.5 parts by weight, 1.7 parts by weight of dioctyl sebacate, 2.4 parts by weight of ES and 0.8 part by weight of lanthanum ricinoleate.
The ultraviolet light stabilizer is prepared by mixing nanometer cerium oxide and Al 2 O 3 Mixing the materials according to the weight ratio of 2:1.6, placing the mixture into an ethanol solution, fully stirring and dissolving the mixture, slowly evaporating the solvent, evaporating the solvent until no ethanol flows out, placing the obtained product into an internal mixer for mixing, wherein the internal mixing temperature is 190 ℃, the internal mixing time is 10min, and the screw rotation speed is 50r/min, thus obtaining the product.
The preparation process of the modified polyurethane comprises the following steps: mixing eugenol glycidyl ether, hexamethylene diisocyanate and a polyurethane prepolymer according to the weight ratio of 1.5:5:10, heating to 120 ℃ in an oil bath, and dehydrating for 2 hours under the vacuum degree of 0.1 MPa; under the protection of nitrogen, cooling to 60 ℃, adding a catalyst with the mass fraction of 0.6% of the polyurethane prepolymer, and reacting for 2.5 hours at constant temperature; after the reaction is finished, washing the mixture for 3 times by using deionized water, and placing the mixture at 60 ℃ for vacuum drying until the weight is constant to obtain the product; wherein, the catalyst is obtained by mixing N, N-dimethylbenzylamine and bisphenol A diglycidyl ether according to the weight ratio of 0.5:2.5, adding the mixture into anhydrous acetone with the weight 1.2 times of that of the mixture, and quickly and uniformly stirring the mixture.
The preparation method of the durable sealant with ultrahigh elongation, high adhesion and high toughness in the embodiment 2 comprises the following steps:
a first step; heating the modified polyurethane to 120 ℃, standing for 15min in vacuum, sequentially mixing with the nano calcium carbonate powder and the ultraviolet stabilizer, stirring and dispersing at 2000r/min for 40min, and filtering by using a 500-mesh filter screen to obtain a component A;
a second step; mixing the prepared component A with nano-cellulose, epoxidized soybean oil, a coupling agent, a plasticizer and lanthanum ricinoleate in sequence, adding the mixture into an 80% ethanol solution with the mass fraction of 1.5 times of the weight of the mixture, stirring and dispersing at 2000r/min for 30min, adding a water removing agent, reacting for 15min, and defoaming at 90 ℃ under the condition that the vacuum degree is 0.2MPa for 10min to obtain the epoxy resin.
The embodiment 3 of the invention discloses a durable sealant with ultrahigh elongation, high adhesion and high toughness, which comprises 196.1 parts by weight of modified polyurethane, 25 parts by weight of nano calcium carbonate powder, 1.8 parts by weight of ultraviolet light stabilizer, 3 parts by weight of nano cellulose, 4 parts by weight of epoxidized soybean oil, ALT-2012 parts by weight, 1.5 parts by weight of dioctyl phthalate, 1.8 parts by weight of VTBS and 0.6 part by weight of lanthanum ricinoleate.
The ultraviolet light stabilizer is prepared by mixing nanometer cerium oxide and Al 2 O 3 Mixing the raw materials according to the weight ratio of 1.5:1.5, placing the mixture into an ethanol solution, fully stirring and dissolving, slowly evaporating the solvent, evaporating until no ethanol flows out, placing the obtained product into an internal mixer for mixing, wherein the internal mixing temperature is 170 ℃, the internal mixing time is 8min, and the screw rotation speed is 40 r/min.
The preparation process of the modified polyurethane comprises the following steps: mixing eugenol glycidyl ether, hexamethylene diisocyanate and polyurethane prepolymer according to the weight ratio of 1.3:4:10, heating to 110 ℃ in an oil bath, and dehydrating for 1.5h under the vacuum degree of 0.08 MPa; under the protection of nitrogen, cooling to 55 ℃, adding a catalyst with the mass fraction of 0.4% of the polyurethane prepolymer, and reacting for 1.8h at constant temperature; after the reaction is finished, washing the mixture for 3 times by using deionized water, and placing the mixture at 55 ℃ for vacuum drying until the weight is constant to obtain the product; wherein, the catalyst is obtained by mixing N, N-dimethylbenzylamine and bisphenol A diglycidyl ether according to the weight ratio of 0.3:2.2, adding the mixture into anhydrous acetone with the weight 1.1 times of that of the mixture, and quickly and uniformly stirring the mixture.
Example 3
The preparation method of the durable sealant with ultrahigh elongation, high adhesion and high toughness of the embodiment 3 comprises the following steps:
a first step; heating the modified polyurethane to 115 ℃, standing for 12min in vacuum, sequentially mixing with nano calcium carbonate powder and an ultraviolet stabilizer, stirring and dispersing at 1800r/min for 35min, and filtering by using a 500-mesh filter screen to obtain a component A;
the second step; mixing the prepared component A with nano-cellulose, epoxidized soybean oil, a coupling agent, a plasticizer and lanthanum ricinoleate in sequence, adding the mixture into an ethanol solution with the mass fraction of 75% and the weight of 1.2 times of the weight of the mixture, stirring and dispersing at 1500r/min for 25min, adding a water removing agent, reacting for 13min, and defoaming for 8min under the condition that the vacuum degree is 0.15MPa at 80 ℃ to obtain the epoxy resin.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Comparative example 1
The durable sealant with the ultrahigh elongation, high adhesion and high toughness comprises 196.1 parts by weight of polyurethane-based adhesive, 25 parts by weight of nano calcium carbonate powder, 1.8 parts by weight of ultraviolet light stabilizer, 3 parts by weight of nano cellulose, 4 parts by weight of epoxidized soybean oil, ALT-2012 part, 1.5 parts by weight of dioctyl phthalate, 1.8 parts by weight of VTBS and 0.6 part by weight of lanthanum ricinoleate. The sealant preparation procedure was identical to example 3.
Test example 1
Various performance tests of the sealant prepared by the invention
The sealant prepared in the embodiment 1, the embodiment 2 and the embodiment 3 of the invention is molded and tested according to the requirements of standard JC/T881-2017 building sealant for concrete joint; the elongation at break test is carried out according to the requirements of dumbbell piece samples in the standard GB/T16777 'test method for building waterproof paint', and the test results are shown in Table 1.
TABLE 1 Properties of sealants made according to various examples of the invention
As can be seen from Table 1, the sealants prepared in the examples 1, 2 and 3 of the invention have good weather resistance, the elongation at break of the sealant is more than 900% after 1500h ultraviolet aging, the elastic recovery rate of the sealant is more than 90%, the mass loss rate of the sealant is less than or equal to 1, and the sealant still can be well bonded with a concrete substrate after heat aging and cold drawing-hot pressing fatigue tests; the destructive test result shows that the adhesive failure area of the sealant and concrete is 0 percent, namely the sealant prepared by the invention has excellent adhesive property with the concrete and has the characteristics of ultrahigh elongation, high durability and high resilience. Therefore, the sealant prepared by the invention can be applied to sealing building joints exposed in the atmospheric environment, such as expansion joints and structural settlement joints of building engineering in the fields of building engineering, municipal engineering, hydraulic engineering and the like, expansion joints of highways, high-speed rails, rail transit, airport runways, reserved expansion joints of channel dams and the like, and provides a long-term protection effect for the building joints.
Test example 2
Self-repairing performance test of sealant prepared by the invention
1. Respectively dissolving the sealants prepared in the embodiment 1, the embodiment 2 and the embodiment 3 in tetrahydrofuran to prepare solutions with mass concentration of 30%; the solutions were then poured into special polytetrafluoroethylene moulds and dried at 60 ℃ for 8h, then at 80 ℃ for 12h under vacuum, and the specimens were cut into 50X 10X 1mm strips for mechanical testing.
2. The specimens prepared above were each cut into a smooth section with a sharp blade and then immediately spliced together, and each was tested for tensile strength at a tensile rate of 100 mm/min. The test results are shown in tables 2 and 3, and the self-repairing function test of the sealant prepared by the invention at the temperature of 2-30 DEG C
As can be seen from Table 2, the tensile strength of the sealant prepared in the invention in example 1, example 2 and example 3 was 0.81MPa, 0.78MPa and 0.89MPa respectively, and the self-healing efficiency was 95.29%, 95.12% and 97.80% respectively when the sealant was left at 30 ℃ for 30 min.
Self-repairing function test of sealant prepared under the condition of 3- (-30 ℃) in table
As can be seen from Table 3, the tensile strength of the sealant prepared in the invention of example 1, example 2 and example 3 was 0.81MPa, 0.73MPa and 0.86MPa respectively, and the self-healing efficiency was 93.83%, 93.59% and 96.63% respectively when the sealant was left at-30 ℃ for 30 min.
Test example 3
Comparison of the Performance of different types of sealants
The performance of the sealant prepared in example 3 was compared with that of the sealant of a treasure company on the market, and the test standards used in the test were the same as those in test example 1, and the test results are shown in table 4 below.
TABLE 4 comparison of the Properties of the different types of sealants
As can be seen from Table 4, the overall performance of the sealant prepared by the invention is not weaker than that of the existing sealant on the market, and the performance of the sealant on the aspect of breaking strength and tensile modulus is better than that of the existing sealant on the market.
Test example 4
Influence of modified polyurethane on self-repairing performance of sealant prepared by the invention
The sealants prepared in comparative example 1 and example 3 were tested for self-repairing performance in accordance with test example 2. The test results are shown in Table 5
TABLE 5 influence of modified polyurethane on sealant self-repairing property at-30 deg.C
From the table 5, it can be seen that the cross section of the sealant prepared by adding the unmodified polyurethane-based adhesive is reconnected and placed for 30min, the fracture surface is not healed, while the cross section of the sealant prepared by the invention is reconnected and placed for 30min to heal, and the self-healing rate reaches 97.80%. According to the invention, when polyurethane is modified, eugenol glycidyl ether and hexamethylene diisocyanate are adopted to seal the polyurethane prepolymer, and then the amine complex catalyst obtained by compounding N, N-dimethylbenzylamine and bisphenol A diglycidyl ether is utilized to obtain the polyurethane with a self-healing function.
Test example 6
Influence of the modified polyurethane on the mechanical property of the sealant prepared by the invention
The mechanical property test of the sealants prepared in the comparative example 1 and the example 3 is carried out, the test standard adopted in the test is consistent with that in the test example 1, and the test result is shown in Table 6
TABLE 6 influence of modified polyurethane on the mechanical Properties of the sealants prepared according to the invention
| Kinds of sealants | Example 3 | Comparative example 1 |
| Elongation at break (23 ℃)/% | 1076 | 540 |
| 100% tensile modulus (23 ℃ C.)/MPa | 0.15 | 0.31 |
| Tensile strength/MPa | 0.91 | 0.68 |
As can be seen from Table 6, the sealant prepared by modifying polyurethane and then adding auxiliary materials shows excellent physical and mechanical properties, because the polyurethane is modified into copolymerized polyurethane, the copolymerized polyurethane not only contains a pi-pi conjugated system to enhance the polymerization force between macromolecules, but also contains a large number of hydrogen bonds in the copolymerized polyurethane molecule, the prepared sealant shows ultra-high elongation under the action of the hydrogen bonds and pi-pi stacking, and the comprehensive mechanical properties are obviously improved.
Test example 7
The sealant prepared by the invention is tested for water resistance
And (3) water resistance test, namely weighing 100g of the sealant prepared in the embodiment 1, the embodiment 2 and the embodiment 3 respectively, placing the sealant in a flat plate mold at room temperature of 25 ℃ for 48h, airing the sealant, drying the sealant in a vacuum oven at 60 ℃ for 24h to obtain a glue film, and soaking the prepared glue film in distilled water for 48 h. And measuring the mass of the sample before and after soaking, and calculating the weight gain rate. The results are shown in Table 7
TABLE 7 determination of Water resistance of sealants prepared according to the invention
As can be seen from Table 7, the sealant prepared by the invention has good water resistance because the epoxidized soybean oil and the lanthanum ricinoleate are added simultaneously when the sealant is prepared, and in a reaction system, the epoxidized soybean oil and the lanthanum ricinoleate are crosslinked with each other to form a water shielding dense network around the modified polyurethane, so that the permeation of water molecules is hindered, and the water resistance of the sealant prepared by the invention is improved.
Test example 8
The sealant prepared by the invention has the self-leveling property measurement
The self-leveling performance of the sealants prepared in the embodiment 1, the embodiment 2 and the embodiment 3 is tested, and the self-leveling degree and the leveling time are tested according to GB/T33403-2016 by adopting test standards; tack free time tested according to GB/T13477.5-2002. The test results are shown in Table 8.
TABLE 8 self-leveling and surface drying Properties of sealants prepared according to the invention
| Item | Example 1 | Example 2 | Example 3 |
| Self-leveling degree/mm | 2.69 | 2.71 | 2.56 |
| Leveling time/s | 91 | 95 | 86 |
| Surface drying time/min | 8 | 9 | 7 |
As is obvious from the table 8, through the test, the self-leveling thickness of the sealant prepared by the invention is controlled within 3mm, the leveling time is controlled within 100s, and the surface drying time is controlled within 10 min; the sealant prepared by the invention has the advantages of high self-leveling speed, thin leveling thickness, short surface drying time and relatively good self-leveling property, and can obviously shorten the construction period in the actual construction process.
Test example 9
Determination of aging resistance of sealant prepared by the invention
The test method comprises the following steps: the sealants prepared in example 1, example 2 and example 3 were subjected to an aging test using a UV2004 sealant compatibility test chamber. And evaluating the ultraviolet aging resistance of the sealant. The UV2004 sealant compatibility test chamber was exposed to a UV lamp at a power of 40Wx 4. The central wavelength of the ultraviolet lamp spectrum is 340nm, and the sample is placed on white paper. The test temperature is 50 ℃, and the test results of surface cracking and chalking conditions are observed after the test is placed for 65 days and are shown in table 9.
TABLE 9 UV aging resistance of sealants prepared according to the invention
| Item | Example 1 | Example 2 | Example 3 |
| Aging situation | Is free of | Is free of | Is free of |
As can be seen from Table 9, the sealant prepared by the invention has excellent performance in ultraviolet aging performance tests for 65 days, and the surface of the sealant has no cracking or chalking.
Claims (9)
1. The utility model provides a durable type of super high elongation high bonding high toughness seals glue which characterized in that: consists of modified polyurethane and auxiliary materials; the auxiliary materials comprise nano-cellulose, epoxidized soybean oil, lanthanum ricinoleate and nano calcium carbonate powder; the weight ratio of the modified polyurethane to the auxiliary materials is 10: 1-3.
2. The durable sealant with ultrahigh elongation, high adhesion and high toughness as claimed in claim 1, wherein the auxiliary materials further comprise: ultraviolet light stabilizer, water removing agent, plasticizer and coupling agent.
3. The ultra-high elongation, high adhesion and high toughness durable sealant as claimed in claim 2, wherein:
the coupling agent is any one of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane or 2- (3, 4-epoxycyclohexyl) ethyl trimethoxy silane and vinyl tributoxy silane;
the plasticizer is as follows: any one of 52# chlorinated paraffin, dioctyl sebacate and dioctyl phthalate;
the water removal agent is 3-butyl-2- (1-ethyl amyl) oxazolidine.
4. The ultra-high elongation, high adhesion and high toughness durable sealant as claimed in claim 2, wherein: the auxiliary materials comprise, by weight, 20-30 parts of nano calcium carbonate powder, 1.1-2.5 parts of ultraviolet light stabilizer, 2-4 parts of nano cellulose, 3-5 parts of epoxidized soybean oil, 1.5-2.5 parts of water removal agent, 1.3-1.7 parts of plasticizer, 1.2-2.4 parts of coupling agent and 0.3-0.8 part of lanthanum ricinoleate.
5. The durable sealant with ultra-high elongation, high adhesion and high toughness as claimed in claim 4, wherein: the ultraviolet stabilizer is prepared from nano cerium oxide and Al 2 O 3 Mixing the materials in a weight ratio of 1-2:1.3-1.6, placing the mixture into an ethanol solution, stirring the mixture fully to dissolve the mixture, slowly evaporating the solvent, evaporating the solvent until no ethanol flows out, placing the obtained product into an internal mixer to mix the mixture, wherein the internal mixing temperature is 150 ℃ and 190 ℃, the internal mixing time is 5-10min, and the screw rotation speed is 30-50 r/min.
6. The ultra-high elongation, high adhesion and high toughness durable sealant as claimed in claim 1, wherein: the preparation process of the modified polyurethane comprises the following steps: mixing eugenol glycidyl ether, hexamethylene diisocyanate and polyurethane prepolymer according to the weight ratio of 1-1.5:3-5:10, heating the mixture to 120 ℃ in an oil bath, and dehydrating the mixture for 1-2 hours under the vacuum degree of 0.05-0.1 MPa; under the protection of nitrogen, cooling to 50-60 ℃, adding a catalyst with the mass fraction of 0.1-0.6% of polyurethane prepolymer, and reacting for 1-2.5h at constant temperature; after the reaction is finished, washing the mixture for 3 times by using deionized water, and placing the mixture at the temperature of between 50 and 60 ℃ for vacuum drying until the weight is constant to obtain the catalyst.
7. The durable sealant according to claim 6, wherein the catalyst is N, N-dimethylbenzylamine and bisphenol A diglycidyl ether in a weight ratio of (0.1-0.5): 2-2.5, adding into anhydrous acetone with the weight 1-1.2 times of the weight of the mixture, and rapidly stirring uniformly to obtain the final product.
8. The process for preparing a durable sealant with ultra-high elongation, high adhesion and high toughness as claimed in any one of claims 1 to 7, wherein: the method comprises the following steps:
a first step; heating the modified polyurethane to 110-;
a second step; mixing the prepared component A with nano-cellulose, epoxidized soybean oil, a coupling agent, a plasticizer and lanthanum ricinoleate in sequence, adding the mixture into an ethanol solution, stirring and dispersing for 20-30min at the speed of 1000-2000r/min, adding a water removing agent, reacting for 10-15min, and defoaming for 5-10min under the condition that the vacuum degree is 0.1-0.2MPa at the temperature of 70-90 ℃ to obtain the epoxy resin.
9. The method for preparing the durable sealant with ultrahigh elongation, high adhesion and high toughness as claimed in claim 8, wherein: the mass fraction of the ethanol solution is 70-80%; the weight of the ethanol solution is 1-1.5 times of the weight of the mixture.
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